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(1) Ensure there are no air bubbles at the tip of the bulb. If any bubbles are present, gently press them out to avoid affecting measurement accuracy.
(2) After removing the electrode from the soaking solution, rinse it thoroughly with deionized water and shake it to remove excess moisture. Avoid using paper towels to wipe the bulb, as this can cause static charge buildup that may affect the glass membrane and slow down potential stabilization. A better approach is to rinse the electrode with the test solution before use.
(3) Once the pH composite electrode is placed into the sample solution, gently agitate it a few times before letting it rest. This helps speed up the electrode’s response time. Especially when using a molded-shell electrode, vigorous shaking is recommended because there's a small cavity between the bulb and the housing. Sometimes, trapped air in this cavity can form bubbles, which may interfere with the contact between the liquid junction and the solution. Stirring vigorously helps eliminate these bubbles for more accurate readings.
(4) After testing viscous samples, rinse the electrode thoroughly with deionized water several times to remove any residue adhering to the glass membrane. In some cases, you may need to clean the electrode with other reagents before rinsing again with water. Finally, soak the electrode in the storage solution to restore its performance.
(5) Avoid exposing the electrode to strong acids, bases, or corrosive solutions. If such solutions must be tested, limit immersion time and ensure thorough cleaning afterward to prevent damage.
(6) Do not use the electrode in dehydrating media like absolute ethanol or concentrated sulfuric acid, as they can damage the hydrated gel layer on the bulb.
The molded-shell pH composite electrode is typically made of polycarbonate (PC), which can dissolve in certain solvents such as carbon tetrachloride, trichloroethylene, and tetrahydrofuran. If your sample contains these solvents, consider using a glass-bodied pH electrode instead to avoid damage. Always check the compatibility of the solvent with the electrode material before use.
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